Fangrui Product Details 1. 24-hole Echo Polyphony Stress Harmonica Instrument 2. Weight: 120 G 3. Number Of Holes: 24 Holes 4. Material: Plastic 5. Size: 17 X 4 Cm Sound Hole 6. Protection And Maintenance Of Harmonica: 7. For Hygienic Health, Use Someone Elses Harmonica. Dont Lend Your Own Harmonica To Others; 8. The Mouthpiece Should Be Rinsed After Eating To Prevent Fine Food Debris From Blowing Into The Pianos Internal Resistance Reed And Sand Or Mute; 9. When Playing, Dont Blow Too Much Or Hit Hard To Avoid Damage To The Gong After Shock. 10. After Playing The Harmonica, Gently Pat The Saliva In The Hole, Then Dry It With A Clean Handkerchief, Wipe The Mouthpiece And The Meat Surface Of The Piano Shell, And Then Put It Into The Piano Case, So That The Dust Will Not Fly Into The Piano; 11. Plastic Grid Harmonica Is Hit Hard, And It Is Easy To Fall Off. If It Is Used For A Long Time, It Can Be Washed With Warm Water Below 40 Degrees Celsius To Prevent The Harmonica From Being Deformed And Damaged; 12. When Playing In Cold Weather, It Is Easy To Be Stuck To The Reed By The Water Vapor, Temporarily Producing No Sound Or Vibrato. Uneven Phenomenon. You Can Shoot The Harmonica Down To Remove The Water Vapor, And Then You Can Return To Normal.